The 43-year-old actress wed Good Charlotte rocker Benji Madden in January 2015 and the pair appear to be happier than ever. As she appeared on The Ellen DeGeneres Show on Thursday (05May16) to promote her new tome The Longevity Book: The Science of Aging, the Biology of Strength, and the Privilege of Time, Cameron spoke about how much her relationship has changed her as a person.

"I do think that marriage, when you can grow with someone, it’s very important," Cameron said. "Someone asked me, 'What’s your favourite thing about being married?' and I said, 'I just learned so much about myself. I didn’t know these things. I would have never known them if I didn’t have my husband to help me'.

"And they said, 'What’s the worst thing about being married?' It’s like, 'Well, I learned all these things about myself that I wish I didn’t know. And I wouldn’t have learned them if I didn’t get married.' So it’s like this double-edged sword."

Cameron didn't elaborate on the things she didn't particularly want to find out about herself. But the actress also admitted that she wouldn't change her marriage for anything.

"I’m just so grateful for it because I couldn’t do it without my husband, and I couldn’t do it with anybody else except him," she shared.

Later in the interview, Cameron was asked by a fan if she uses any pet names to refer to her spouse.

"I call him a lot of names," she laughed. "'Muh-buh' You know how things start 'baby' then to 'bae' then it goes to 'buh'? Soon I’m just going to go 'uh' and he’s going to know I’m talking to him!"

Cameron has also found different ways to honour her husband, such as dedicating her new book to him. In a note penned in the preface of The Longevity Book she wrote: "I never knew what love was until I found you. How did I ever live without your love, your friendship, your brilliant mind, your genius sense of humour, and your enormous, loving, beautiful heart?

"Thank you for being my best friend, my teacher, my partner in life. You inspire me every day with your courage and devotion. Thank you for all the support and encouragement in this book and everything in life. I love you forever and ever."